4
6/16 - Subject to change. © Belimo Aircontrols
USA
, Inc
Problem Possible Cause Action
A Sensor is Not
Detected or
Out of Range
RAH Sensor.
Display shows “RAH
sensor not detected
operation by OAH
enthalpy”
Sensor previously detected is not present. Previously configured for differential enthalpy, now economizing will be based on
single enthalpy. The valid range for reading an RAH sensor for auto detection is 0.6VDC (6%RH) to (100%RH) up to 11.0 VDC.
Using a voltmeter set to read AC input voltage at TH sensor terminal R, verify that there is 24 VAC +/- 20% (19 VAC – 29
VAC). If input voltage is not present, check continuity of wiring between ECON-ZIP-TH sensor and ECON-ZIP-BASE, If voltage
is present, remove wires from RH+ and RH- and measure across the two terminal using voltmeter set to DC. If DC output
voltage is within valid range above, check continuity of RH+ and RH- output wires between ECON-ZIP-TH sensor and ECON-
ZIP-BASE. If continuity OK, go to settings menu and submenu Devices 2. Verify that display for RAH is Auto or Installed. If
Auto, change it to Installed and see if Alarm disappears or a value RAH value is displayed in Monitor Live Conditions menu.
Also can try to Delete alarm and see if sensor is again auto detected. If sensor was intentionally disconnected then go to:
Alarm, Delete Alarms, select the alarm. When prompted to, press enter to permanently delete, press OK.
Alarm “Y2
Present
Without Y1”
Potential wiring or
thermostat problem
Thermostat input to ZIP Economizer has energized Y2 (2nd stage cooling) and has not energized Y1 (1st stage cooling). This
configuration is not allowed. The economizer will recognize this and will treat Y2 signal as if it is Y1 and will energized 1st
stage cooling (Mechanical or Free Cooling). Check to see if wires are reversed between thermostat and economizer input.
Verify continuity to see if circuit could be open or wire could be broken. Test to see thermostat 1st stage relay is closing (Y1
has 24 VAC). Make sure there are no jumpers between R and Y2.
Alarm “Heat
and Cool Both
Present"
Potential wiring or
thermostat problem
This alarm indicates that 24 VAC is at both terminal Y1 and W1 on the ZIP-ECON-BASE. Check for wiring problems. Note:
this alarm is disabled when Heat Pump operation has been turned to On in Settings menu.
Alarm “SAT
Drop for CC1
Insufficient
Cooling System
Problem”
Potential compressor,
refrigerant, or supply fan
problem
The ZIP Economizer reads the SAT value just before energizing 1st stage mechanical cooling. After compressor has
started and 4 minutes have elapsed, SAT value is again checked. If SAT has not dropped by at least 5°F then this alarm is
generated. Some possibilities are:
• Filters or coils are dirty or blocked – inspect.
• SAT sensor in location where are is not mixed - perform temperature traverse.
• Indoor fan is inoperable - check relay, belt, motor, bearings.
• Condenser fan is inoperable - check relay, motor, head pressure control.
• Compressor is faulty (internal damage) - check amperage, pressures.
• Contactor energizes but compressor is out on internal/external overload.
• High voltage problem to compressor -check wiring, phases, contactor.
• Circuit 1 is low on refrigerant - check charge.
• Cycle power
Alarm “SAT
Drop for CC2
Insufficient
Cooling System
Problem”
Potential compressor,
refrigerant, or supply fan
problem
The ZIP Economizer reads the SAT value just before energizing 2nd stage mechanical cooling. After compressor has
started and 4 minutes have elapsed, SAT value is again checked. If SAT has not dropped by at least 5°F then this alarm is
generated. Troubleshoot as above for 1st stage.
Alarm “SAT
Should Be
Lower”
Potential damper,
linkage, or actuator
problem
When in Free Cooling and damper still open, if the SAT is not within 10°F or the OAT, then this alarm will be generated.
Exception when the damper is modulated to obtain the SAT setpoint of 55°F. Some possibilities are:
• Check damper linkages.
• Check actuator clamp / interface between damper is secure.
• Check that damper blades secured to damper shaft properly.
• Check that both outside air damper and return damper stroke properly.
• Check that return damper closes tightly when outdoor damper is full open.
• Check that OAT sensor is in the airflow path and not subjected to solar radiation.
• Check that SAT sensor is in a location that airflow is mixed.
Alarm “Damper
Pos Value
Missing”
Actuator or wiring
problem
The connected actuator must have a feedback wire terminated at ACT5 on the ECON-ZIP-BASE. The range should be
between 2-10 VDC. Verify voltage with multimeter. Remove feedback wire and check voltage between terminal C and the
feedback wire. If no voltage, replace actuator.
Alarm “Damper
is Stuck”
Damper or linkage
problem
The feedback from the actuator is used to determine the position of the damper. If the ZIP Economizer commands the
damper to drive open to a designated % and the feedback measured does not achieve the commanded value, then this
alarm will be generated.
• Check damper linkages.
• Check to see if anything is in the way of damper.
• Check that actuator limit stop not adjusted to smaller angle.
Damper rotation below
what is allowed
If the damper rotation is less than 85% and the Economizer Test has not been run to scale the output to the damper travel,
this alarm may occur.
Alarm
“Compressor 1
Not Detected”
Alarm
“Compressor 2
Not Detected”
CC1 output circuit is
open
When the ZIP Economizer is first powered, it detects the presence of the compressor control circuit. If the circuit is
detected as open, this alarm will be generated. Check all wiring, connectors, and devices in series between CC1 and
contactor coil.
ZIP E
n
miz
roubleshootin
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